JPH033644A - Brushless motor - Google Patents

Abstract

PURPOSE:To make a motor small-sized and thin-shaped by providing a printed coil forming a conductor pattern of a driving coil, a conductor pattern for rotating speed (FG) signal detection and a conductor pattern for rotating position (PG) signal detection to a stator opposite to a rotor magnet. CONSTITUTION:A printed coil 1 is constituted by providing a driving coil 3, an FG conductor pattern 4 and a PG conductor pattern 5 on a disc insulating sheet 2. These driving coil 3, FG pattern 4 and PG pattern 5 are formed by etching and plating, and is formed on the same surface of the insulating sheet 3 at the same time. This insulating sheet 2 is provided to a stator opposite to a rotor magnet 9 of a rotor 25.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a small brushless motor suitable for use in a VTR, etc., and particularly relates to the structure of a printed coil for cantering formed by etching, plating, etc. .

[Conventional technology]

For example, a rotary drum north motion motor of a rotary head drum device in a VTR is described in Japanese Patent Application Laid-Open No. 150125/1982. This drive motor is a brushless motor, and has a rotor fixed to a rotating drum rotatably attached to a fixed central shaft, and a stator fixed to a fixed drum.

Built into the rotating drum device. The rotor has an annular rotor magnet magnetized into multiple poles, and the stator is provided with a drive coil facing the rotor magnet. , a repulsive force and an attractive force are generated between the rotor magnet and the drive coil, causing the rotor, and therefore the drum, to rotate once.

Further, this rotary head drum device is provided with a frequency generator (FG) for detecting a rotational speed signal and a pulse generator (PG) for detecting a rotational position signal. FG consists of a multi-pole split magnetized FG magnet attached to a rotating member such as the rotor of a brushless motor, and a magnetically sensitive element fixedly provided opposite to the FG magnet, in which the magnetically sensitive element rotates. By detecting the magnetic poles of P
G consists of a single PG magnet with a single magnetic pole attached to a rotating member such as a rotating drum of a rotating head drum device, and a PG coil fixedly provided opposite to the PG magnet, and the PG coil rotates. By detecting the magnet, the rotational position of the rotor and therefore of the drum for one revolution (
Generates a rotational position signal (PG double signal) representing the rotational phase). FG double signal is used to control the rotation speed of the rotating drum to a specified speed, and the PG double signal sets the rotational phase of the rotating drum to the specified phase. Used for control.

[Problem to be solved by the invention]

By the way, in the above-mentioned conventional technology, the FG and PG are provided independently from each other and independently from the brushless motor, and furthermore, the FG magnet.

It is composed of parts such as a PG magnet, a magnetically sensitive element, and a PG coil. For this purpose, these FG, PC
Since a space is required to install the head drum device, the structure of the single-rotation head drum device becomes complicated and the scale becomes large. To prevent this.

If you try to arrange these FG and PG in a brushless motor, it will hinder the miniaturization and thinning of the brushless motor.
Similarly, it is impossible to make the rotary head drum smaller and thinner.

In addition, in order to install FG and PG, it is necessary to install and connect these parts, and this work requires a long time, resulting in high costs. However, there was a problem in that the performance and reliability of the FG and PG deteriorated due to accuracy and other factors.

The object of the present invention is to solve this problem and to reduce the size of the device.

Our goal is to provide a thin, highly reliable, and low-cost brushless motor.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an insulating sheet on which a conductor pattern for a drive coil, a conductor pattern for FG signal detection, and a conductor pattern for PG signal detection are formed by etching, plating, etc., on a rotor. Provided on the stator opposite the rotor magnet.

[Effect]

A printed coil in which a conductor pattern of a driving coil is formed on an insulating sheet by etching or plating, and a conductor pattern is further formed on the insulating sheet by etching or plating. FG and PG signal generation means are provided.

FG and PG generate FG multiplied signals by the rotation of the rotor, respectively.

These FG and PG are built into the brushless motor, and like the drive coil, the signal detection means for the FG and PG are composed of extremely thin conductor patterns, so they can be driven by a brushless motor such as the above-mentioned rotating head drum device. It is not necessary to provide FG and PG in the device that is used for printing, and space for FC and PG in this device is no longer required, and the configuration can be simplified.
Even if G signal generating means is provided, the printed coil is very thin, and the brushless motor can be made smaller and thinner.

Further, the conductor patterns of the drive coil, FG, and PG signal generating means are simultaneously formed on the insulating sheet by etching, plating, or the like. For this reason, the performance of these signal generating means is good, and these signals can be generated at the same time as the insulating sheet is provided on the stator, and reliability is also improved.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 (mountains) to (B) show an embodiment of the brushless motor according to the present invention, in which the figure (mountains) is a plan view showing a printed sheet, and the figure (b) is a plane view of the print sheet (0). -), and (c) is a plan view showing the magnetic pole surface of the rotor.
The same figure (B) is a sectional view showing a rotary head cylinder device equipped with a brushless motor of this embodiment, and 1 is a printed coil.

2 is an insulating sheet, 3 is a drive coil, 4 is an FG conductor pattern, 5 is a PC conductor pattern, 6 is a lead wire extraction part, 7A
, 7B is a through hole, 8 is a rotor yoke, 9 is a rotor magnet, 10 is a FG magnet, 11 is a PG magnet, 12 is a rotating drum, 13 is a fixed drum, 14 is a rotary transformer, 15A, 15B are bearings, I6 is a preload spring , 17 is a head base, 18 is a rotating head, 19 is a rotating shaft, 20 is a rotating disk, 21 is a back yoke, 2
2 is a ground brush, 23 is a coil holder, 24 is a fixed arm, and 25 is a rotor.

In FIG. 1 (mountain), a drive coil 3. FG conductor pattern 4. A printed coil 1 is configured by providing a PG conductor pattern 5. These drive coil 3, FG conductor pattern 4. P
The G conductor pattern 5 is a conductor pattern formed by etching, plating, etc., and is simultaneously formed on the same surface of the insulating sheet 2. The FG conductor pattern 4 is arranged on the insulating sheet 2 on the outer peripheral side of the drive coil 3, and has a one-round pattern bent in a rectangular wave shape. P.G.
One conductor pattern 5 is arranged on the inner peripheral side of the drive coil 3, and as shown in FIG. 1(b), it forms a spiral pattern wound a predetermined number of times. A lead wire from one terminal of this PG conductor pattern 5 was led out to a lead wire draw-out portion 6 of an insulating sheet 2, and a lead wire from the other terminal was provided at the center of the PG conductor pattern 5 through an insulating sheet 1. The lead wires are first drawn out to the back surface of the insulating sheet through the through hole 7A, and then led out to the lead wire drawing portion 6 through the through hole 7B provided on the outside of the PG conductor pattern 5 in the insulating sheet 2.

Note that the drive coil 3. The lead wires from the terminals of the FG conductor pattern 4 are also guided to the lead wire pull-out portions 6, respectively. Also,
The conductor patterns 3, 4, 5 on the insulating sheet 2 and the lead wires except for the lead wire extraction portion 6 are covered with an insulating coating material.

In FIG. 1(C), in the rotor 25, the insulating sheet 2
(Fig. 1 (mountain)) A circular rotor yoke 8 having a central hole with a diameter approximately equal to that of the circular rotor yoke 8 is provided with an annular rotor magnet 9 that is polarized in multiple polarities in the circumferential direction. An annular FG magnet magnetized with multiple polarities in the circumferential direction is provided on the outer periphery side of the magnet 9, and a unipolar PG magnet 11 is provided on the inner periphery side of the rotor magnet 9. N pole in this FG magnet 10.

The length of each magnetic pole of the S pole is set equal to the length between two adjacent edges of the rectangular wave of the FG conductor pattern 4 in FIG. 1 (mountain).

Next, a rotary head drum device equipped with a brushless motor consisting of the printed coil 1 shown in FIG. 1 (mountain) and the rotor 25 shown in FIG. 1 (C) will be described with reference to FIG. 1 (B).

In FIG. 1(d), a rotating disk 20 is fixed to the upper end of a rotating shaft 19 that is mounted on a fixed drum 13, and a rotating drum 12 is fixed to this rotating disk 20 with screws. A helad base 17 is attached to the lower surface of the rotating drum 12 (the surface facing the fixed drum 13), and a rotating head 18 is mounted on this head base 17.

Further, a rotary transformer 14 is arranged between the rotating drum 12 and the fixed drum 13. A rotating core portion of the rotary transformer 14 is attached to the lower surface of the rotating disk 20, and a fixed core portion is attached to the fixed drum 13 opposite thereto. This rotary transformer 14 electrically connects the rotary head 18 and an external circuit.

Furthermore, a fixed arm 24 is fixed to a part of the outer circumferential surface of the fixed cylinder 13, and a ground brush 22 and a coil holder 23 are fixed to the tip of the fixed arm 24 with screws, and the contact at the tip of the ground brush 22 rotates. It is in contact with the shaft 19. Note that a preload spring 16 is attached between the bearings 15A and 15B of the rotating shaft 19, so that the bearings 15A and 15
A preload is applied to B.

In this configuration, the printed coil 1 shown in FIGS. 1(0-) and 1(b) is installed with the rotating disk 20 fitted into its center hole and fixed to the coil holder 23 at the outer periphery. ing. In addition, on the upper surface of the rotating drum 12, facing the printed coil 1, as shown in FIG.
A rotor 25 shown in is attached. These printed coils 1 and the rotor 25 constitute a brushless motor, and when they are attached as one or more, the drive coil 3 of the printed coil 1 (Fig. Similarly, the FG conductor pattern 4 faces the FG magnet 10, and the PG conductor pattern 5 faces the PG magnet 11. A back yoke 21 is provided above the printed coil 1 and fixed to a rotating disk 20, forming a magnetic path on the stator side of the brushless motor.

Therefore, when a drive current is applied to the drive coil 3 at a predetermined conduction angle, a repulsive force is generated between it and the rotor magnet 9.

As a result, the rotating drum 122, rotating disk 202, and rotating shaft 19 rotate together, and therefore, the rotating head 1
8 also rotates around the rotation axis 19. In recording and reproducing modes, a magnetic tape (not shown) runs in contact with the outer peripheral surfaces of the rotating drum 12 and fixed drum 13, respectively, and the rotating head 18 rotates and scans this magnetic tape, thereby recording or recording signals. Playback occurs.

Also, when the rotor 25 rotates, the FG on the printed coil 1
The conductive pattern detects changes in the magnetic field caused by the FG magnet 10 on the rotor 25 and outputs a signal multiplied by the frequency of the rotating drum 12 according to the rotation speed. The PG conductor pattern on the printed coil 1 is connected to the PC magnet 11 on the rotor 25.
Detects the magnetic field caused by the drum 12 and generates a PG multiplied signal representing the rotational phase of the drum 12 for one rotation.

These FG multiplied signals and PG multiplied signals are taken out from each lead wire of the lead wire pull-out section 6 in FIG. 1 (mountain).

These leads are connected to an external circuit.

As described above, in this embodiment, the FG and PG signal detection means (FG conductor pattern 4.PG conductor pattern) are formed as a conductor pattern on an insulating sheet, so they are different from those used in the prior art described earlier. Magnetically sensitive element or wire-wound PG
Parts that require large space such as coils are no longer required, and these signal detection means can be installed inside the brushless motor.

This brushless motor can be made smaller and thinner.

Further, the signal detection means is on the same insulating sheet.

Since they can be formed at the same time as the drive coil by etching or plating, the manufacturing process for these signal detection means is simplified and their dimensional accuracy can be improved.

The placement accuracy on the insulating sheet 2 is improved, and in addition, these signal detection means are placed inside the brushless motor along with the installation of the wA total receipt motor on the stator side, which greatly simplifies the installation work. . moreover,
Lead wires drawn out from each conductor pattern are drawn out from the lead wire draw-out portion 6 of the insulating sheet 2, and by soldering, etc., it is possible to significantly shorten working time and improve productivity. - The cost of the layer can be reduced and superior performance can be obtained.

2 to 4 are plan views showing printed coils in other embodiments of the brushless motor according to the present invention, respectively,
Parts corresponding to those in FIG. 1 are given the same reference numerals.

In the specific example shown in FIG. 2, the FG conductor pattern 4 for the drive coil 3 is different from that shown in FIG. 1 (L:L). PG conductor pattern 5
The arrangement relationship of
are similarly arranged on the outer peripheral side of the drive coil 3.

Further, the specific example shown in FIG. 3 is the FG conductor pattern 4. P
The G conductor pattern 5 is arranged on the insulating sheet 2 on the inner circumferential side than the coil 3, and the PG conductor pattern 5 is arranged on the inner circumferential side than the FG conductor pattern 4.

Furthermore, the specific example shown in FIG. 4 has the FG conductor pattern 4.
The PG conductor pattern 5 is placed on the insulation sheet 2, and the PG conductor pattern 5 is arranged on the outer circumferential side of the FG conductor pattern.

As described above, even if the conductor patterns 3 to 5 are arranged on the insulating sheet 2 as shown in FIGS. 2 to 4, the same effect as the printed coil shown in FIG. 1 (mountain) can be obtained. Note that the rotor magnets 9. FG magnet 10.
It goes without saying that the arrangement of the PG magnet 11 (FIG. 1(C)) is different.

FIG. 5 is a plan view showing printed coils of still another embodiment of the brushless motor according to the present invention, 5A, 5
B is a PG conductor pattern having the structure shown in FIG. 1(b), and portions corresponding to those in FIG. 1 are given the same reference numerals and explanations thereof will be omitted.

In this embodiment, two PG conductor patterns 5A.

5B are respectively arranged on the insulating sheet 2 at positions shifted by 180 degrees. The spiral directions of these PG conductor patterns 5A and 5B are opposite to each other, and the signals that they output when detecting the magnetic field have opposite polarities. Furthermore, since these PG conductor patterns 5A and 5B are connected in series or in parallel, and their output signals have opposite polarities,
Even if these detect a magnetic field from the rotor magnet 9, these output signals are added together to significantly reduce noise due to this magnetic field.

In addition, PG conductor patterns 5A and 5B are PG magnets 1
1, a PC signal in which pulses of positive polarity and pulses of negative polarity are arranged alternately is obtained, but a PG multiplied signal consisting of pulses of one polarity can be obtained by using a comparator circuit etc. However, a pulse of one polarity which is unnecessary for the PG multiplied signal can also be used as the PG multiplied signal reset pulse.

In this embodiment as well, the drive coil, FG conductor pattern, and PG conductor pattern may be arranged on the insulating sheet 2 as shown in FIGS. 2 to 4.

11g moving coil 3. FG conductor pattern 4. Although all of the PG conductor patterns 5 are provided on the same surface of the insulating sheet 2, they may be provided separately on the front and back surfaces of the insulating sheet 2.

FIG. 6 shows still another embodiment of the brushless motor according to the present invention, in which the figure (mountains) is a front view of the printed coil, FIG. 6 (b) is a back view, and FIG. It is a plan view showing a rotor, and parts corresponding to the previous drawings are given the same reference numerals.

In this embodiment, in the printed coil 1, only the drive coil 3 is provided on the surface of the insulating sheet 2 (the surface facing the rotor), as shown in FIG. As shown in FIG. 6(b), an FG conductor pattern 4 and a PG conductor pattern 5 are provided. In addition, in the rotor 25, as shown in FIG.
A single-pole PG magnet 11 is provided on the inner circumferential side thereof.

The printed coil 1 and rotor 25 are shown in FIG.
, ), the drive coil 3 is arranged so as to face the rotor magnet 9.

Along with this, the FG conductor pattern 4 on the back side of the insulating sheet 2. PG conductor patterns 5 are connected to rotor magnets 9 through insulating sheets 2, respectively. It faces the PG magnet 11.

Here, the FG conductor pattern 4 is a one-turn conductor pattern bent into a rectangular wave shape, and the distance between two adjacent edges of this rectangular wave shape is equal to the circumferential length of each magnetic pole of the rotor magnet 9. .

Moreover, the length of this edge is set to be approximately equal to the width of the rotor magnet 9. The PG conductor pattern 11 is shown in Figure 1 (
It has the same structure as b).

Therefore, these printed coils 1. When the rotor 25 is attached as shown in FIG. 1(d) and the rotor 25 is rotated by passing current through the drive coil 3 at a predetermined conduction angle, the PG conductor pattern 5 detects the PG magnet 11. The PG double signal is generated, but the FG is output and the FG double signal is generated.

As described above, in this embodiment, the same effects as those of the previous embodiments can be obtained, but the FG magnet can be omitted, and the number of parts can be reduced, resulting in lower costs.

FIG. 7 is a diagram showing a printed coil in still another embodiment of the brushless motor according to the present invention, showing the front and back sides of the printed coil in half, and FIG. 6(L)
, (b) are given the same reference numerals.

In the figure, drive coil 3. FG conductor pattern 4. P
The G conductor pattern 5 has the same structure as those shown in FIG. 6, and similarly to the embodiment shown in FIG. and are provided on the back side of the insulating sheet 2, respectively.
On this back surface, the FG conductor pattern 4 is provided on the inner circumference side, and the PG conductor pattern 5 is provided on the outer circumference side. Although not shown, in the rotor, the rotor magnet 9 is provided on the inner circumferential side and the PG magnet 11 is provided on the outer circumferential side, contrary to the arrangement shown in FIG. 6(C). Also in this embodiment, the FG conductor Pattern 4 detects the magnetic field of the rotor magnet and generates an FG multiplied signal.

As mentioned above, this embodiment is simply the opposite of the arrangement of the FG conductor pattern 4 and the PG conductor pattern 5 from the embodiment shown in FIG. Effects similar to those of the embodiment can be obtained.

FIG. 8 is a plan view showing a printed coil in still another embodiment of the brushless motor according to the present invention, and parts corresponding to those in FIG. 6 are given the same reference numerals.

In the same figure, a drive coil 3 is arranged along the same circumference on the same surface of the insulating sheet 2, but instead of the drive coil 3, the FG conductor in FIG. 6(b) is placed on a part of this circumference. An FG conductor pattern 4 having the same shape as the pattern 4 is arranged. PG conductor pattern 5 is FG conductor pattern 4
It is located on the outer periphery side. As a rotor, the 6th
In Figure (c), a configuration is adopted in which the rotor magnet 9 and the PG magnet 11 are arranged in a reverse relationship.

Also in this embodiment, the FG conductor magnet 4 detects the magnetic field of the rotor magnet and generates an FG multiplied signal. Therefore, the same effect as the embodiment shown in FIG. 6 can be obtained. Moreover, drive coil 3. FG conductor pattern 4. It is possible to arrange the PG conductor pattern 5 and the insulating sheet on the same surface, and the surface of the printed coil 1 can be used effectively, and the performance of the motor can be improved.

FIG. 9 is a plan view showing a printed coil of still another embodiment of the brushless motor according to the present invention, in which parts corresponding to those in FIG. 8 are given the same reference numerals.

In the figure, a drive coil 3 is provided on the same surface of an insulating sheet 2 over the entire circumference, and this drive coil 3
An arcuate FG conductor pattern 4 having the same structure as the FG conductor pattern 4 shown in FIG. 6(b) is arranged on the inner circumferential side. The rotor has a configuration in which the drive coil 9 and the PG magnet 11 are arranged in an opposite manner as shown in FIG. 6(C). The width of the drive coil 3 facing the FG conductor pattern 4 (the length in the radial direction of the insulating sheet 2) is set narrower than the width of the rotor magnet.
and the FG conductor pattern 4 are arranged to face the rotor magnet. In the part where the FG conductor pattern 4 is not provided, the drive coil 3 extends to the circumference where the FG conductor pattern 4 is arranged, and its width makes the width of the rotor magnet approximately equal, and the drive coil 3 extends to the circumference where the FG conductor pattern 4 is arranged. Make it face the magnet across the entire width.

As described above, also in this embodiment, the FG multiplied signal can be generated by the FG conductor pattern 4 detecting the magnetic field of the rotor magnet, and the same effect as the embodiment shown in FIG. 8 can be obtained.

Fig. 10 shows still another embodiment of the brushless motor according to the present invention, the figure (mountains) is a plan view showing the printed coil, and the figure (b) is an enlarged view of the PG signal generator in the figure (tL). 26 is an MR (magnetic thin film resistor) pattern, and 27A and 27B are sensing sections.

28A and 28B are input electrodes, 29 is an output electrode, and 30 is a DC power source, and parts corresponding to those in the previous drawings are given the same reference numerals.

In FIG. 10 (mountain), on the same surface of the insulating sheet 2,
Similar to FIG. 1 (mountain), drive coil 3. FG conductor pattern 4. A P(di number generator) consisting of an MR pattern 26 is provided. As a rotor for this printed coil 1, a rotor having the configuration shown in FIG. 1(c) can be used.

As shown in FIG. 10(b), the MR pattern 26 has two
Two sensing sections 27A and 27B are connected to each other with an output electrode 29 in common, and an input electrode 28A of the sensing section 27A.

A DC voltage is applied from the DC type 130 between the input electrodes 28B of the sensing section 27B.

Due to the rotation of the rotor 25 shown in FIG. 1(Q), the PG magnet 11 (FIG. 1(C)) is attached to the sensing parts 27A and 27B.
When the magnetic field from the sensor changes, these sensing parts 27A, 27B
The resistance value of the output electrode 29 changes, and the voltage at the output electrode 29 changes. In this case, the sensing parts 27A and 27B are arranged in the rotational direction of the rotor, so that the sensing parts 27A and 27B are first
, 27B is applied with the magnetic field from the PG magnet, and then this magnetic field is applied to the other. Therefore, when a magnetic field is applied to the sensing section 27A, its resistance value changes, and when a magnetic field is applied to the sensing section 27B, its resistance value changes, so that the PG magnet passes through the sensing sections 27A and 27B. When.

The voltage generated at the output electrode 29 changes approximately sinusoidally.

In this way, an FG multiplied signal is obtained from the MR pattern 26, and the same effect as the embodiment shown in FIG. 1 can be obtained.

In addition, in the embodiment shown in FIG. 10, MR conductor pattern is used instead of the PG conductor pattern 5 of the printed coil 1 in FIG. 1 (mountain).
Although this corresponds to the case where the pattern 26 is used, this MR pattern 26 may be used instead of the PG conductor pattern 5 in each of the above embodiments.

By using the MR pattern 26, even when the motor rotates at a low speed, the PG double signal can be generated at a high level, and the rotational phase of the rotor, and thus the rotating drum, can be detected with high accuracy.

In each of the above embodiments, one printed coil is used for the motor, but it is also possible to overlap multiple printed coils and connect the corresponding patterns between these printed coils as desired to attach them to the motor. You may also do so.

〔Effect of the invention〕

As explained above, according to the present invention, as a printed coil, the FGG signal generator and the PGG signal generator are provided as a conductor pattern together with the drive coil on the same insulating sheet. , even if a PGG signal generator is provided, the printed coil is very thin, the stator can be made thin, and the motor can be made smaller and thinner.

In addition, since these drive coils, FGG generators, and PGG generators can be formed simultaneously by etching or plating, their placement accuracy is also high, which greatly improves productivity and reduces costs. becomes.

Furthermore, by attaching the insulating sheet to the motor, the FGG signal generator and PGG signal generator are also attached to the motor, making installation of these signal generators easy and greatly reducing work time. However, since the lead wires at the terminals of the drive coil and each signal generator can all be formed using conductive patterns, there is no need to connect the lead wires, and reliability is greatly improved.

Furthermore, by using two PGG signal generators whose output signal polarities are different from each other, the PGG signal generator detects the magnetic field of the rotor magnet, thereby removing noise components mixed in the PG multiplied signal. Possible, P
The G-times signal S/N is improved, and the detection accuracy of the rotational phase is improved.

Furthermore, by using the MR pattern as the PGG signal generator, the PG borrowing signal can be accurately generated even when the motor rotates at low speed.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the brushless motor according to the present invention, the figure (mountain) is a plan view of a printed coil, and the figure (b) is a plan view of a printed coil.
is a sectional view of a rotary head drum device of a VTR to which this embodiment is installed. 2 to 5 are plan views showing printed coils in other embodiments of the brushless motor according to the present invention. FIG. 6 shows still another embodiment of the brushless motor according to the present invention, in which (LL) is a plan view showing the front surface of the printed coil, FIG. 6 (b) is a plan view showing the back surface, and FIG. ) is a plan view of the rotor. 7 to 9 are plan views showing printed coils in still other embodiments of the brushless motor according to the present invention. FIG. 10 shows still another embodiment of the brushless motor according to the present invention, in which the figure (mountain) is a plan view of a printed coil, and FIG. 10(b) is an enlarged view of the MR pattern in the figure (mountain). 1...Printed coil, Nikawa insulation sheet, 3...
・IHI coil, 4...FGG body pattern. 5.5A, 5B...PGG body pattern, 9...Rotor magnet, 10...FG magnet. 11...PG magnet, 25...rotor, 26
...MR pattern.ゐ1 Mouth n1 No. Otsuo Sumemi 40 Ta5 6 (Phantom tb> Koro Dai de Enminato Otsu (C) Tasu/θ eyes (a) (b n

Claims (1)

[Claims] 1. Consists of a rotor having an annular rotor magnet divided into multiple poles and a stator provided with a drive coil facing the rotor magnet, the drive coil being energized for a predetermined amount. In a brushless motor in which the rotor is rotated by energizing only the corners, a first conductor pattern as the drive coil, a second conductor pattern as a frequency generator for rotational speed signal detection, and a rotational position signal detection are provided on the insulating sheet. A brushless motor characterized in that a printed coil formed with a third conductor pattern serving as a pulse generator is provided on the stator so as to face the rotor magnet. 2. In claim 1, the second conductor pattern is an annular pattern bent into a rectangular wave shape, and the third conductor pattern is a circular pattern bent into a rectangular wave shape.
A brushless motor characterized in that the conductor pattern is a spiral pattern. 3. The brushless motor according to claim 1 or 2, wherein the two third conductor patterns having different output polarities are arranged on the insulating sheet at an angular interval of 180°. 4. In claim 1 or 2, the second conductor pattern is provided on the insulating sheet in a region facing the rotor magnet, and detects changes in the magnetic field from the rotor magnet to generate a rotational speed signal. A brushless motor characterized by being configured as follows. 5. The brushless motor according to claim 4, wherein the drive coil is provided on one surface of the insulating sheet, and the second and third conductor patterns are provided on the other surface, respectively. 6. The brushless motor according to claim 4, wherein the first, second, and third conductor patterns are provided on the same surface of the insulating sheet. 7. Consists of a rotor having an annular rotor magnet magnetized into multiple poles and a stator provided with a drive coil facing the rotor magnet, and by energizing the drive coil for a predetermined energization angle. In the brushless motor in which the rotor rotates, a first conductor pattern as the drive coil, a second conductor pattern as a frequency generator for detecting a rotational speed signal, and a pulse generator for detecting a rotational position signal are provided on the insulating sheet. A brushless motor characterized in that a printed coil having a magnetic thin film resistance pattern formed thereon is provided on the stator to face the rotor magnet. 8. The brushless motor according to claim 7, wherein the second conductive pattern is an environmental pattern bent into a rectangular wave shape. 9. The brushless motor according to claim 7 or 8, wherein the two magnetic thin film resistance patterns having different output polarities are arranged on the insulating sheet at an angular interval of 180°.